ID 2.5.1.118 DE beta-(isoxazolin-5-on-2-yl)-L-alanine synthase. CA isoxazolin-5-one + O-acetyl-L-serine = 3-(5-oxoisoxazolin-2-yl)-L-alanine CA + acetate + H(+). CC -!- The enzyme from the plants Lathyrus odoratus (sweet pea) and CC L.sativus (grass pea) also forms 3-(5-oxoisoxazolin-4-yl)-L-alanine CC in vitro (cf. EC 2.5.1.119). CC -!- However, only 3-(5-oxoisoxazolin-2-yl)-L-alanine is formed in vivo. CC -!- 3-(5-oxoisoxazolin-2-yl)-L-alanine is the biosynthetic precursor of CC the neurotoxin N(3)-oxalyl-L-2,3-diaminopropanoic acid, the cause of CC lathyrism. CC -!- Closely related and possibly identical to EC 2.5.1.47 and CC EC 2.5.1.51. //